Garden Closed

Due to the closure of the U.S. Capitol Campus to the public, the U.S. Botanic Garden continues to have altered operations.  Bartholdi Fountain and Gardens and the Terrace Gardens are open while the Conservatory and gated outdoor gardens are temporarily closed. Please monitor for updates on operating status. Many resources can be accessed online, including educational materials, virtual tours, and online programs. Connect with resources from home at

Clay's hibiscus or Kokiʻo ʻula

Hibiscus clayi
Plant Botanical Name: 
Hibiscus clayi
USBG Plant Location: 
Conservatory Room Location: 
Plant Threat Level: 

Known as Koki`o `ula in Hawaii, Hibiscus clayi is an endangered tree endemic to the dry forests in the Nounou Mountains on the island of Kaui. Today, in large part due to livestock grazing, development and invasive plants there is only one naturally occurring population with only four individual plants. Because of habitat protection efforts and the propagation by botanic gardens, such as National Tropical Botanic Gardens, there is a slow increase in the numbers of plants found in forest preserves. Private landowners and public land managers also are working to carefully manage use of these threatened habitats.